Disable alignment check (#344)

firmware/Makefile

@@ -8,7 +8,7 @@ include			$(PROJECT_ROOT)/make/git.mk
 include 		$(PROJECT_ROOT)/applications/applications.mk
 include			$(PROJECT_ROOT)/lib/lib.mk
 
-CFLAGS += -Werror
+CFLAGS += -Werror -Wno-address-of-packed-member
 CPPFLAGS += -Werror
 
 TARGET			?= f4